The wasp might have had a little more to do with your feeling bad than you think. Last year I was out on a short 40-mile ride. I was going down a steep hill, just broke 50 MPH, when a wasp went into my jersey. I was stung several times in the chest while I wrestled the bike to a halt, but I guess that's better than crashing. I stopped, got the wasp out, and continued on. I was riding well that day and keeping a pace well above 20 mph. With about 10 miles to go, I flatted. After fixing the flat I started pedaling again, and felt very sick to my stomach and very achey. I could barely keep 15 MPH. I arrived at home and felt that way for the rest of the day. Later I shared my story with a friend that has some medical experience, and he thought my feeling sick was most likely a reaction I had with the sting more than any thing else.